Trainer Aidan O'Brien put the blame firmly with himself for City Of Troy's slow start and 8th-placed finish in the Breeders' Cup Classic at Del Mar. Sierra Leone came out on top on the dirt surface as O'Brien's star never got into contention under Ryan Moore. ------------------- Enjoy the best of Sky Sports Racing on the free and award-winning At The Races app: iPhone: http://apple.co/1I4NxAV Android: http://bit.ly/1VPIcEz #Subscribe https://facebook.com/AtTheRaces https://twitter.com/AtTheRaces https://instagram.com/at.the.races